14 Nov '12, 6pm

Prospecting for Oil or Gold? Check the Time: Advances in atomic clocks allow detailed relativistic measurements

Prospecting for Oil or Gold? Check the Time: Advances in atomic clocks allow detailed relativistic measurements

Clocks low in the gravity well run slower than those higher up. That’s just a relativistic fact of life—one that we take advantage of every time we use the Global Positioning System. (I remember how cool I thought it was when I first learned that clocks in orbiting GPS satellites have to be programmed to correct for relativistic time dilation.) Within the past year, experimentalists comparing t he speeds of widely separated atomic clocks (connected via fiber optic cable) have shown that current chronometers, with uncertainties around 10-16 , are sensitive enough to detect the change in time’s flow that accompanies a shift of a meter or less in relative elevation. The geoid is the Earth-swaddling surface of equal gravitational potential that more or less coincides with global mean sea level. Or, from the chronometric viewpoint, the surface on which all clocks tick at the sa...

Full article: http://spectrum.ieee.org/tech-talk/at-work/test-and-measu...

Tweets

Check this out guys

Check this out guys

“We don’t just sell health and beauty products. We help customers to ‘Look Good, Feel Great, Have Fun,’ and if you step in...

New post: Check, Check, Check

New post: Check, Check, Check

mealsandmiles.com 24 Nov '12, 7pm

We’ve already had quite the productive day around here. Derek and I stayed through the weekend to knock out a few wedding ...

IEA Oil Forecast Unrealistically High; Misses D...

theoildrum.com 15 Nov '12, 9pm

The oil price forecasts underlying these and other forecasts in the report are approximately as follows: Figure 2. Author’...

Check out my Rolex.

twitpic.com 18 Nov '12, 12am

Copy & paste this code into your website <a href="http://twitpic.com/be4btn" title="Check out my Rolex. on Twitpic"><img s...

Do the math: Bill McKibben takes on Big Oil

greenbiz.com 14 Nov '12, 6pm

Most Americans own cars. Most cars run on gasoline. Can we be persuaded to think of the oil industry as the enemy? What ab...

New Post: Pile On The Miles Check In

New Post: Pile On The Miles Check In

runeatrepeat.com 12 Nov '12, 4pm

This morning I did most of Jillian’s 6 Week Six Pack (skipped the burpees) and then ate a happy meal. That would be Cinnam...

Report: Researchers pressure cook algae into crude oil in one minute

Report: Researchers pressure cook algae into cr...

green.autoblog.com 15 Nov '12, 1am

Researchers at the University of Michigan have discovered a fast way to turn algae into biocrude oil, a clean substitute f...

U.S. Will Overtake Saudi Arabia in Oil Production by 2020

U.S. Will Overtake Saudi Arabia in Oil Producti...

spectrum.ieee.org 14 Nov '12, 3pm

Already considered the Saudi Arabia of coal and of natural gas, the United States will soon become the Saudi Arabia of oil...

U.S. to become world's largest oil producer in ...

news.mongabay.com 13 Nov '12, 9am

mongabay.com November 13, 2012 In a dramatic reversal, the United States is set to become the world's largest producer of ...

How do you check whether a date is in a date ra...

rubyflow.com 11 Nov '12, 6pm

How do you check whether a date is in a date range? Posted by julian7 on November 11, 2012 — 0 comments We all know (start...

This Clock Knits a Scarf and Tells the Time

This Clock Knits a Scarf and Tells the Time

treehugger.com 14 Nov '12, 10am

365 is stitching the time as it passes by. It is knitting 24 hours a day and one year at the time, showing the physical re...

A Yahoo-Facebook Search Partnership? Reality Check Time!

A Yahoo-Facebook Search Partnership? Reality Ch...

searchengineland.com 19 Nov '12, 5am

Really? Why? Why would an alliance with Yahoo do something for Facebook that Facebook’s existing partnership with Bing doe...

Did Peak Oil Doomers Fixate On a False Scenario?

Did Peak Oil Doomers Fixate On a False Scenario?

treehugger.com 13 Nov '12, 9am

Some time back I wrote that activism beats prophecy when it comes to peak oil . It was, in part, a reaction to doomers lik...

Britain’s red postboxes to stay gold for Olympic heroes

Britain’s red postboxes to stay gold for Olympi...

luxuo.com 15 Nov '12, 4pm

Postboxes painted gold to celebrate Britain’s Olympic champions will not be repainted in the traditional “pillarbox red”, ...